Lois Cook, 57, was found dead after a friend called police to check on her because she hadn't shown up for work and had missed an important meeting.

Police said Bruce Cook, 62, was at the home on Windsor Street when they arrived Wednesday night. He answered the door and allegedly told police, "I don't know where she is. I haven't slept with her for 10 years and she has many lovers." He then gave police permission to search the house.

Authorities say they found dried blood on the floor of the kitchen, and the stains led to the basement steps. Down the stairs, they found a tarp covering Lois Cook's body.

Lt. Kevin Kraus said the husband tried to wash the blood off the staircase that led from the kitchen to the basement where his wife's body was found.

A neighbor described Lois Cook as an incredible woman who worked at Highmark and took care of her husband despite his history of mental illness, and she said his claim of unfaithfulness was not true. "You just knew he was a ticking time bomb," the neighbor said. "You just knew something was going to happen."

The bomb squad was also called because a device was found near the body, but it turned out not to be dangerous.

At first, Bruce Cook was charged with abuse of a corpse. Police continued to investigate Thursday and filed a charge of criminal homicide in the afternoon.

Hillary Clinton's office said "nothing nefarious was at play" when the former secretary of state used her personal email address, rather than one provided by the State Department, during her four years as America's top diplomat.